Oblivious character, but oblivious in the way that they're very self aware about their own feelings and just assumes that they're an open book and that everyone knows exactly how they feel even though nobody can tell shit
Like something comes up and they're just soo frustrated because "because i'm in love with you?!? Obviously?!??"
And every single mother fucker around including the person they're in love with is like "!?!?!?!? YOU ARE?!?!?!?!"
I think part of what I love so much about shipping RoyEd, especially with massive au's and crossovers, is that people interact with Roy first right? And he's a smarmy charming asshole military guy who's also actually intelligent but acting like he's not to cover for his conniving ass plots. So clearly the thought is "oh he's for sure the one to keep an eye on here."
And then you look at Ed. Motherfucker would deny God's existence to his face, is a cataclysmic event given human form, has the worst language seen outside of a dockyard, and is so blindingly brilliant he makes other people's life work seem meaningless and childish with how easily he can comprehend and even improve it.
And Roy seems like a normal fucking dude in comparison, especially since let's be honest, he was pursued by Ed, and like... How do you resist 1) someone that insanely amazing and breathtaking 2) someone who has no regards for boundaries because they've already dissected your feelings and thoughts and decided this is gonna happen hell or high water and false refusals won't stop this train.
One of my favorite aspects of those two is that Roy, for at least a while, looks at Ed as "gremlin child with nukes for hands" while the rest of the military looks at Roy like that and it makes everything about them coming together into a relationship all the more hilarious
Also I’d love to see Roy and Kisuke try and out manwhore each other
Ed and/or Roy mention alchemy one time and Ichigo is like "Stop, look, listen to me. If you introduce a new power system in my general vicinity I will somehow adapt and/or have secretly been 1/8th alchemist the entire time. And that is a threat."
Kisuke: He keeps it interesting. It's one of his more attractive qualities
Ed: I knew a few people who were 1/8th an alchemist once.
Everyone but Roy: What?
Ed: Nevermind
Izuku: I uh, I'm not going to have to eat any hair am I?
Everyone:
Kisuke: *abruptly turning to Roy* SO! You're last name is Mustang? Are you part horse?
Roy: Well, now that you mention it
Aizawa: *slowly realizing that he might in fact be the normal one here*